volmgt_symname(3volmgt) [sunos man page]
volmgt_symname(3VOLMGT) Volume Management Library Functions volmgt_symname(3VOLMGT) NAME
volmgt_symname, volmgt_symdev - convert between Volume Management symbolic names, and the devices that correspond to them SYNOPSIS
cc [ flag ... ] file ... -lvolmgt [ library ... ] #include <volmgt.h> char *volmgt_symname(char *pathname); char *volmgt_symdev(char *symname); DESCRIPTION
These two routines compliment each other, translating between Volume Management's symbolic name for a device, called a symname, and the /dev pathname for that same device. volmgt_symname() converts a supplied /dev pathname to a symname, Volume Management's idea of that device's symbolic name (see volfs(7FS) for a description of Volume Management symbolic names). volmgt_symdev() does the opposite conversion, converting between a symname, Volume Management's idea of a device's symbolic name for a vol- ume, to the /dev pathname for that device. RETURN VALUES
volmgt_symname() returns the symbolic name for the device pathname supplied, and volmgt_symdev() returns the device pathname for the sup- plied symbolic name. These strings are allocated upon success, and therefore must be freed by the caller when they are no longer needed (see free(3C)). ERRORS
volmgt_symname() can fail, returning a null string pointer, if a stat(2) of the supplied pathname fails, or if an open(2) of /dev/volctl fails, or if any of the following is true: ENXIO Volume Management is not running. EINTR An interrupt signal was detected while trying to convert the supplied pathname to a symname. volmgt_symdev() can fail if an open(2) of /dev/volctl fails, or if any of the following is true: ENXIO Volume Management is not running. EINTR An interrupt signal was detected while trying to convert the supplied symname to a /dev pathname. EXAMPLES
Example 1: Testing Floppies The following tests how many floppies Volume Management currently sees in floppy drives (up to 10): for (i=0; i < 10; i++) { (void) sprintf(path, "floppy%d", i); if (volmgt_symdev(path) != NULL) { (void) printf("volume %s is in drive %d ", path, i); } } Example 2: Finding The Symbolic Name This code finds out what symbolic name (if any) Volume Management has for /dev/rdsk/c0t6d0s2: if ((nm = volmgt_symname("/dev/rdsk/c0t6d0s2")) == NULL) { (void) printf("path not managed "); } else { (void) printf("path managed as %s ", nm); } ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+ SEE ALSO
cc(1B), vold(1M), open(2), stat(2), free(3C), malloc(3C), volmgt_check(3VOLMGT), volmgt_inuse(3VOLMGT), volmgt_running(3VOLMGT), attributes(5), volfs(7FS) NOTES
These routines only work when Volume Management is running. BUGS
There should be a straightforward way to query Volume Management for a list of all media types it's managing, and how many of each type are being managed. SunOS 5.10 31 Dec 1996 volmgt_symname(3VOLMGT)
Check Out this Related Man Page
media_findname(3VOLMGT) Volume Management Library Functions media_findname(3VOLMGT) NAME
media_findname - convert a supplied name into an absolute pathname that can be used to access removable media SYNOPSIS
cc [ flag ... ] file ... -lvolmgt [ library ... ] #include <volmgt.h> char *media_findname(char *start); DESCRIPTION
media_findname() converts the supplied start string into an absolute pathname that can then be used to access a particular piece of media. The start parameter can be one of the following types of specifications: /dev/... An absolute pathname in /dev, such as /dev/rdiskette0, in which case a copy of that string is returned (see NOTES on this page). /vol/... An absolute Volume Management pathname, such as /vol/dev/aliases/floppy0 or /vol/dsk/fred. If this supplied path- name is not a symbolic link, then a copy of that pathname is returned. If the supplied pathname is a symbolic link then it is dereferenced and a copy of that dereferenced pathname is returned. volume_name The Volume Management volume name for a particular volume, such as fred (see fdformat(1) for a description of how to label floppies). In this case a pathname in the Volume Management namespace is returned. volmgt_symname The Volume Management symbolic name for a device, such as floppy0 or cdrom2 (see volfs(7FS) for more information on Volume Management symbolic names), in which case a pathname in the Volume Management namespace is returned. media_type The Volume Management generic media type name. For example, floppy or cdrom. In this case media_findname() looks for the first piece of media that matches that media type, starting at 0 (zero) and continuing on until a match is found (or some fairly large maximum number is reached). In this case, if a match is found, a copy of the pathname to the volume found is returned. RETURN VALUES
Upon successful completion media_findname() returns a pointer to the pathname found. In the case of an error a null pointer is returned. ERRORS
For cases where the supplied start parameter is an absolute pathname, media_findname() can fail, returning a null string pointer, if an lstat(2) of that supplied pathname fails. Also, if the supplied absolute pathname is a symbolic link, media_findname() can fail if a read- link(2) of that symbolic link fails, or if a stat(2) of the pathname pointed to by that symbolic link fails, or if any of the following is true: ENXIO The specified absolute pathname was not a character special device, and it was not a directory with a character special device in it. EXAMPLES
Example 1: Sample programs of the media_findname() function. The following example attempts to find what the Volume Management pathname is to a piece of media called fred. Notice that a volmgt_check() is done first (see the NOTES section on this page). (void) volmgt_check(NULL); if ((nm = media_findname("fred")) != NULL) { (void) printf("media named "fred" is at "%s" ", nm); } else { (void) printf("media named "fred" not found "); } This example looks for whatever volume is in the first floppy drive, letting media_findname() call volmgt_check() if and only if no floppy is currently known to be the first floppy drive. if ((nm = media_findname("floppy0")) != NULL) { (void) printf("path to floppy0 is "%s" ", nm); } else { (void) printf("nothing in floppy0 "); } ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |MT-Level |MT-Unsafe | +-----------------------------+-----------------------------+ SEE ALSO
cc(1B), fdformat(1), vold(1M), lstat(2), readlink(2), stat(2), free(3C), malloc(3C), volmgt_check(3VOLMGT), volmgt_inuse(3VOLMGT), volmgt_root(3VOLMGT), volmgt_running(3VOLMGT), volmgt_symname(3VOLMGT), attributes(5), volfs(7FS) NOTES
If media_findname() cannot find a match for the supplied name, it performs a volmgt_check(3VOLMGT) and tries again, so it can be more effi- cient to perform volmgt_check() before calling media_findname(). Upon success media_findname() returns a pointer to string which has been allocated; this should be freed when no longer in use (see free(3C)). SunOS 5.10 31 Dec 1996 media_findname(3VOLMGT)